Improved luminescent properties of Eu³⁺ activated phosphor α-Sr₂P₂O₇ by charge compensation

Abstract

A series of phosphors Sr_2−xP₂O₇:xEu³⁺ (x = 0.02–0.16), Sr_2−2xP₂O₇:xEu³⁺, xM⁺ (x = 0.1, M = Li, Na, K) and Sr_2−2xP₂O₇:xEu³⁺ xNa⁺ (x = 0.02–0.16) were synthesized through high-temperature solid-state reaction. It is found that Na⁺ is the best compensator among Li⁺, Na⁺, K⁺ by XRD and emission analysis. The luminescent properties of Sr₂P₂O₇:Eu³⁺, Na⁺ were dramatically improved in the aspect of the emission intensities and chromaticity, comparing with Sr₂P₂O₇:Eu³⁺ (without charge compensation). And the mechanism of which was discussed in detail. Under the excitation of 393 nm, charge compensated phosphors Sr₂P₂O₇:Eu³⁺, Na⁺ show intense red emission at 610 nm, which is attributed to the ⁵D₀ → ⁷F₂ transition of Eu³⁺ ions. The luminescence decay, concentration quenching and temperature quenching effect were also investigated. The results indicated that Sr₂P₂O₇:Eu³⁺, Na⁺ may be a candidate as a red component in lighting field.